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Definition of thermochemistry in US English:

thermochemistry

noun

The branch of chemistry concerned with the quantities of heat evolved or absorbed during chemical reactions.

‘This facilitated the steady advances being made in the field of thermodynamics and in thermochemistry, which is the application of thermodynamics to chemical processes.’

‘The lecture begins with an introduction to thermochemistry, the study of heat flow to or from a chemical reaction.’

‘Therefore, the present work attempts to extend the existing research on the solid-state thermochemistry of burning wood to include polymers.’

‘The basic laws of thermochemistry can be expressed in terms of the change in enthalpy.’

‘Links are given to rules of thermochemistry and explanations of endothermic and exothermic reactions.’

‘This line of research was later developed by the Swiss-Russian chemist Henri Hess in the 1830s. Hess's development and extension of the work of Lavoisier and Laplace has earned him the title of father of thermochemistry.’

‘All of the laws of thermochemistry follow from the fact that the enthalpy H of a substance is one of its properties.’